I'm having a hard time finding a local supply of quality steel and aluminum tubing, and the only carbon fiber cloth supplier I can find has a few lines on their website, selling 0.5m x 100 cm x 0.35mm pieces. And they aren't replying to my messages, the quantities I need for a bicycle are probably way below their usual order quantities.
I've considered a hollow plywood frame. I can only get 4mm, 5mm and 3/5" thicknesses locally, and only one choice in wood. I'd like to reinforce it by wrapping it in carbon fiber, but... Would fiber glass do as good a job, at a weight penalty?
Hardwood is sort of available locally, but varies from the US varieties, and I don't have heavy duty tools to hollow it out, assuming I can glue the halves together.
Any other thoughts?